The National Weather Service issued two flood warnings Friday for the Napa and Guerneville rivers, as radar tracked “copious” amounts of moisture moving swiftly throughout parts of the San Francisco Bay Area. Rob Mayeda, Stephanie Chuang and Anthony Slaughter reports. (Published Friday, March 11, 2016)

The National Weather Service issued two flood warnings Friday for the Napa and Guerneville rivers, as radar tracked “copious” amounts of moisture moving swiftly throughout parts of the San Francisco Bay Area.

Heavy rain pounded through Sonoma and Marin counties on Friday, for the third consecutive day, and rain pelted most every other of the seven remaining Bay Area counties, too.

Possible thunderstorms were also in the forecast, especially for the Point Reyes region and further south to Big Sur.

The weather service said minor flooding is expected to occur on the Napa River near St. Helena late Friday morning to afternoon and on the Russian River near Guerneville Friday night and Saturday, where waters could rise to as high as 25 feet.